html{   
    width: 100%;   
    height: 100%;   
    overflow: hidden;   
    font-style: sans-serif;   
}   
body{   
    width: 100%;   
    height: 100%;   
    font-family: 'Open Sans',sans-serif;   
    margin: 0;     
    background: url(img/背景3.jpg) no-repeat; 
}   
#login{   
    position: absolute;   
    top: 50%;   
    left:50%;   
    margin: -150px 0 0 -150px;   
    width: 300px;   
    height: 300px;   
    text-shadow:0 0 10px;  
}   
#login h1,p{   
    color: #e67113;   
    letter-spacing: 1px;  
    text-align: center;   
}   
h1{   
    font-size: 2em;   
    margin: 0.67em 0;   
}   
input{   
    width: 278px;   
    height: 18px;   
    margin-bottom: 10px;   
    outline: none;   
    padding: 10px;   
    font-size: 13px;   
    color: black;      
    border-top: 1px solid #eff15d;   
    border-left: 1px solid #eff15d;   
    border-right: 1px solid #eff15d;   
    border-bottom: 1px solid #eff15d;   
    border-radius: 4px;   
    background-color: #f0e68c;   
}   
.but{   
    width: 300px;   
    min-height: 20px;   
    display: block;   
    background-color: #ffa500;   
    border: 1px solid #ff8000;   
    color: #fff;   
    padding: 9px 14px;   
    font-size: 15px;   
    line-height: normal;   
    border-radius: 5px;   
    margin: 0;   
}  
a{text-decoration: none;}